I would have it as the most important in my natural medicine cabinet, if i were you. I use it everyday, when I remember, to counter the effects of stress, not just the prevention of worse illnesses. (When external stressors can seem powerful, you need something powerful in your court.)
It is the most potent, in supplement form, as found at natural health food stores, as a tart yellow powder. Pricey, but worth it, when an ounce of prevention is worth a pound of cure. It is also found in whole form in apples and onions.
It is a potent antioxidant that is called a bioflavonoid, that strengthens immunity, energizes, and good for any problem you might have, esp. against stroke, heart issues, respiratory issues, and cancer, as a complement and support, to any treatment you may be having and would be a great to help you face challenges ahead. It is supposedly good for kidneys, but not in high doses, just more frequent.
You dont have to have a prescription or doctors permission to take it or to sample it. As a sports nutritionist I recommend it for sports endurance and recovery, so since it is in capsule form, you can add it to sports drink smoothie.